Improved key



To all whom it`mafy concern: Be it known that I, EMERY PARKER, of New Brit- EMEIUI PARKER, or NEW Burnin, CONNECTICUT.

` umarmen: No. 90,121,- dazed May 1s, 1869.

I mnovnn xm?.

The Schedule talented to in these Letters Patentl ,and making part of che sama ain, in the county of Hartford, and State 'of Oonnectient, have invented a new and useful Improvement in Keys; and I dohereby declare that the following specification, taken in connection with the drawings, making a part of the same, is a full, clear, and exact description thereof.

Thel improvement herein described is applicable specially to extension-keys, whichare intended to be contracted'in length for convenience in carrying, andl to be extended when applied to use; and l The invention consists in the means by'which the sliding portions of the shank are `connected together,

and locked when extended.

In the drawings exhibiting the key'with the irnprovementl Av B represent respectively' the two members of which the shank is composed; The portion A is madeof twoy side pieces, united in a common bow, a, such side pieces being separated by an intermediate space, which is filled by the portion B, when the latter is inserted between-the side piece, as seen at Figure 3.

The member A has a slot, b, cutthrough its longitndinal axis, theA end of such slot being curved, as seen at c, and returned for a short `distance in the line of the axis of thes'traight port-ion of the slot b, as shown at d.

Two pins e e', whose centres are separated by. a distance nearly equal to the length of the chord of the curve c, pass through the member A, as seen, and furnish the means by which the two parts of the shank are kept in connection. i

It is obvious that when the key is lto be extended to `its full length, the pin c will stand at the end of the curve in the slot, and upon sliding the twomembers in the line of their axis, as if to contract the key, the end of the reverse slot will bring up against the pin e, as seen'at Figure 1, and prevent further movement in that direction;

To contract the shank, the member B should first be pulled forward far enough to bring the pin tothe end of the curve c, when` it can be easily pushed into `the position shown at g. 3.

What I claim as my invention', and desire to secure by Letters Patent, is-

The improvement, which consists in unitngthe two` members A andB of the shank of an extension-key, by means ol' the slot b,- terminated by the reverse curved slot c d, formed in one member, in combination with the fixed pms e c, in the other member, the

whole 'operating in the manner substantially as def scribed, -for the purposes specified.

' EMEEY PARKER.

Witnesses M. S. Wurm, L. Woonmnar.n 

